I think I have to put this here for future reference because I couldn’t find anyone mentioned this method while searching for a fix.
I tried to put screen protector on the top screen of my 3DS XL, and naively I applied too much pressure to remove screen protector bubbles. Unfortunately the screen appeared a huge bright pressure spot, clearly visible against bright-colored or white background. It doesn’t affect gameplay, but it was annoying.
It seems like the LCD panel and the outer layer were compressed by the pressure of my finger. I tried “massaging” the screen, blowing it with hair-dryer (don’t) but none worked.
So I use a small suction cup (the one used to lift phone screens) and gently pull the screen up to release pressure and it worked! The spot became “thinner” and now it almost invisible.
Disclaimer: this issue is annoying but minor, it cannot magically fix bent LCD panel or structural damage
TLDR: using suction cup can remove bright pressure spots on LCD screen
Posted by datzonzon